Table component bugs — falsy values lost, runtime crash when columns missing, class typo, and unstable keys

[mukeshdhadhariya]

This PR fixes multiple issues in next-cloudinary/docs/components/Table/Table.js:

• Preserve falsy values (like 0 and empty string) in cells by only replacing null/undefined.
• Add default fallbacks for columns and data to avoid runtime crashes.
• Guard usage of columns in tbody.
• Fix Tailwind class typo last pr-0 -> last:pr-0.
• Avoid variable shadowing by renaming column index variable to colIndex.
• Use stable row keys (row.id ?? rowIndex) instead of just rowIndex.

Testing:

• Render table with data containing 0 and ensure 0 displays.
• Render component with columns undefined and some data and ensure no runtime error.
• Verify header / cell spacing respects last:pr-0.

[mustafaazad03]

Hey, are you solving this issues?

[mukeshdhadhariya]

yes i have already open a PR #613 there i changes two file so review that PR
and also a bug in you code for that i raise a issue #612 that is also solved in PR #613
so review and merge